【発明の詳細な説明】 〔産業上の利用分野〕 この発明は電源系統の高調波電流成分を抑制するため
のアクティブフィルタ装置に関するものである。Description: TECHNICAL FIELD The present invention relates to an active filter device for suppressing a harmonic current component of a power supply system.
第３図は例えば三菱電機技報vol.62.No6.1988P15〜P2
0に開示されたこの種従来のアクティブフィルタ装置の
構成を示す回路図である。図において、（１）は電源、
（２）はこの電源（１）に接続された補償対象負荷で、
インバータ等高調波を発生する高調波源（３）と進相コ
ンデンサ等の容量性負荷（４）とからなっている。
（５）は補償対象負荷（２）に流入する負荷電流I1を検
出する電流変成器、（６）は電流変成器（５）の出力を
もとに負荷電流I1の高調波電流成分と同一（但し、電流
の方向は図中の矢印の向きを正方向と考える）の補償電
流Icを出力するアクティブフィルタである。FIG. 3 shows, for example, Mitsubishi Electric Technical Report vol.62.
FIG. 1 is a circuit diagram illustrating a configuration of a conventional active filter device of this type disclosed in FIG. In the figure, (1) is a power supply,
(2) is a load to be compensated connected to the power supply (1),
It comprises a harmonic source (3) for generating harmonics such as an inverter, and a capacitive load (4) such as a phase advance capacitor.
(5) a current transformer for detecting a load current I1 flowing into the compensated load (2), (6) a harmonic current component of the load current I1 output to the original current transformer (5) same (however, the direction of the current is the direction indicated by an arrow in the drawing considered a positive direction) is an active filter for outputting a compensation current Ic of.
そして、電源電流Is内に含まれる上記高調波電流成分
をアクティブフィルタ（６）による補償電流Icで相殺し
て抑制する訳である。Then, it is reason to the harmonic current components contained in the power source current Is suppressed by canceling by the compensation current Ic by active filter (6).
ところで、補償対象負荷（２）が高調波源（３）のみ
で構成されている場合、そのインピーダンスは十分大き
いのでアクティブフィルタ（６）から出力された補償電
流Icはそのすべてが低インピーダンスの電源（１）側へ
流れて上記した通りの高調波電流の抑制が達成される。Incidentally, the compensation if the target load (2) consists of only harmonic source (3), that the impedance is sufficiently large compensation current Ic outputted from the active filter (6), all of the low-impedance power supply ( 1), the suppression of the harmonic current as described above is achieved.
しかし、第３図に示すように、補償対象負荷（２）に
容量性負荷（４）が含まれていると、高調波の次数によ
って電源（１）よりこの容量性負荷（４）のインピーダ
ンスが低くなり、補償電流Icの一部が補償対象負荷
（２）の方へ流れることになる。このため、電流変成器
（５）で検出する高調波電流成分の一部が増大すること
になり、結果として電流変成器（５）およびアクティブ
フィルタ（６）でなる制御系が正帰還となってその動作
が不安定になるとともに電源電流Isの高調波電流が逆に
増大する可能性がある。However, as shown in FIG. 3, when the capacitive load (4) is included in the load (2) to be compensated, the impedance of the capacitive load (4) is increased by the power supply (1) depending on the order of harmonics. low, part of the compensation current Ic will flow towards the compensated load (2). Therefore, a part of the harmonic current component detected by the current transformer (5) increases, and as a result, the control system including the current transformer (5) and the active filter (6) becomes a positive feedback. harmonic current of the power supply current Is, along with its operation becomes unstable is likely to increase in the opposite.
この発明は以上のような問題点を解消するためになさ
れたもので、安定した制御特性が得られ高調波電流が増
大する恐れがないアクティブフィルタ装置を得ることを
目的とする。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an active filter device which has stable control characteristics and does not increase harmonic current.
この発明に係るアクティブフィルタ装置は、補償対象
負荷に流れる負荷電流を検出する負荷電流変成器および
容量性負荷に流れる電流を検出する容量性負荷電流変成
器を備え、上記両電流変成器を出力差から高調波源に流
れる電流を求めその電流の高調波電流成分と同一の補償
電流を系統へ送出するようにしたものである。An active filter device according to the present invention includes a load current transformer that detects a load current flowing through a load to be compensated and a capacitive load current transformer that detects a current flowing through a capacitive load, and outputs an output difference between the two current transformers. , A current flowing through the harmonic source is obtained, and the same compensation current as the harmonic current component of the current is sent to the system.
補償電流を決定する検出負荷電流から容量性負荷に流
れ込む電流成分が除かれる。従って、制御系の不安定な
正帰還動作は解消される。The current component flowing into the capacitive load is removed from the detected load current that determines the compensation current. Therefore, the unstable positive feedback operation of the control system is eliminated.
第１図はこの発明の一実施例によるアクティブフィル
タ装置の構成を示す回路図である。図において、（１）
ないし（６）は従来と同一のもので説明は省略する。
（７）は容量性負荷（４）に流入する電流Ifを検出する
電流変成器、（８）は電流変成器（５）の出力から電流
変成器（７）の出力を差引く演算回路で、その出力は差
電流I*としてアクティブフィルタ（６）に送出される。FIG. 1 is a circuit diagram showing a configuration of an active filter device according to one embodiment of the present invention. In the figure, (1)
Steps (6) to (6) are the same as those in the related art, and a description thereof will be omitted.
(7) is a current transformer for detecting the currentIf flowing into the capacitive load (4), and (8) is an arithmetic circuit for subtracting the output of the current transformer (7) from the output of the current transformer (5). , Its output is sent to the active filter (6) as a difference current I* .
即ち、I*＝ II−Ifとなる。そして、アクティブフィ
ルタ（６）はこの差電流I*の高調波電流成分を制御目標
値として補償電流Icを出力する。That is, theI* = I I -If. The active filter (6) outputs a compensation current Ic of the harmonic current components of the differential current I* as a control target value.
このように、アクティブフィルタ（６）によって補償
電流Icを出力する制御系は、高調波源（３）のみが発生
する高調波電流成分を対象とし、容量性負荷（４）の電
流Ifはその対象から除外しているので、従来のような正
帰還の現象は発生せず、安定した制御特性が得られる。
そして、高調波源（３）からの高調波電流成分はアクテ
ィブフィルタ（６）による補償電流Icによって相殺さ
れ、電源電流Isの高調波電流成分は確実に抑制される。In this way, the control system for outputting a compensation current Ic by an active filter (6) is directed to a harmonic current component only harmonic source (3) occurs, the current If of the capacitive load (4) that Since it is excluded from the target, the phenomenon of the positive feedback unlike the related art does not occur, and stable control characteristics can be obtained.
The harmonic current component from the harmonic source (3) is canceled by the compensation current Ic by active filter (6), the harmonic current components of the power supply current Is is reliably suppressed.
なお、差電流I*を求めるための各電流変成器の設置個
所は必ずしも第１図の実施例のものに限られる訳ではな
い。即ち、第２図に示す実施例では、負荷電流I1を直接
検出する替わりに、電流変成器（９）および（10）によ
り電源電流Isおよび補償電流Icを検出し、更にこれらの
出力電流を演算回路（11）で加算して間接的に負荷電流
I1を求め、これを演算回路（８）の加算側端子へ入力し
ている。この場合にも、前掲の実施例と同様の動作によ
り同等の効果を奏する。The location of each current transformer for obtaining the difference current I* is not necessarily limited to the embodiment of FIG. That is, in the embodiment shown in FIG. 2, instead of detecting the load current I1 directly detects the power source current Is and the compensation current Ic by a current transformer (9) and (10), further of these output The current is added by the arithmetic circuit (11) and the load current is indirectly calculated.
Seeking I1, and enter it into the addition terminal of the arithmetic circuit (8). Also in this case, the same operation as the above-described embodiment provides the same effect.
この発明は以上のように構成されているので、補償電
流を出力する制御系に正帰還の不安定な動作が発生する
ことがなくなり、電源の高調波電流成分を確実に抑制す
ることができる。Since the present invention is configured as described above, an unstable operation of positive feedback does not occur in the control system that outputs the compensation current, and the harmonic current component of the power supply can be reliably suppressed.
第１図はこの発明の一実施例によるアクティブフィルタ
装置の構成を示す回路図、第２図はこの発明の他の実施
例によるものを示す回路図、第３図は従来のアクティブ
フィルタ装置の構成を示す回路図である。 図において、（１）は電源、（２）は補償対象負荷、
（３）は高調波源、（４）は容量性負荷、（５）（７）
は電流変成器、（６）はアクティブフィルタ、（８）は
演算回路、Isは電源電流、I1は負荷電流、Icは補償電
流、Ifは容量性負荷の電流、I*は差電流である。なお、
各図中同一符号は同一または相当部分を示す。FIG. 1 is a circuit diagram showing a configuration of an active filter device according to one embodiment of the present invention, FIG. 2 is a circuit diagram showing a configuration according to another embodiment of the present invention, and FIG. 3 is a configuration of a conventional active filter device. FIG. In the figure, (1) is a power supply, (2) is a load to be compensated,
(3) is a harmonic source, (4) is a capacitive load, (5) (7)
Current transformer, (6) the active filter (8) operation circuit, Is is the supply current, I1 is the load current, Ic is the compensation current, If is the capacitive load of the current, I* is the difference It is a current. In addition,
The same reference numerals in the drawings indicate the same or corresponding parts.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2186318AJP2893882B2 (en) | 1990-07-11 | 1990-07-11 | Active filter device |
| US07/727,602US5162983A (en) | 1990-07-11 | 1991-07-09 | Active filter device for suppressing harmonics in a system including a capacitive load |
| KR1019910011764AKR950012948B1 (en) | 1990-07-11 | 1991-07-11 | Active filter device |
| DE4123005ADE4123005C2 (en) | 1990-07-11 | 1991-07-11 | Active filter device for suppressing harmonics in a power supply system that has a capacitive load |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2186318AJP2893882B2 (en) | 1990-07-11 | 1990-07-11 | Active filter device |
| Publication Number | Publication Date |
|---|---|
| JPH0471331A JPH0471331A (en) | 1992-03-05 |
| JP2893882B2true JP2893882B2 (en) | 1999-05-24 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2186318AExpired - LifetimeJP2893882B2 (en) | 1990-07-11 | 1990-07-11 | Active filter device |
| Country | Link |
|---|---|
| US (1) | US5162983A (en) |
| JP (1) | JP2893882B2 (en) |
| KR (1) | KR950012948B1 (en) |
| DE (1) | DE4123005C2 (en) |
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| KR920003635A (en) | 1992-02-29 |
| KR950012948B1 (en) | 1995-10-23 |
| JPH0471331A (en) | 1992-03-05 |
| DE4123005C2 (en) | 1997-03-06 |
| DE4123005A1 (en) | 1992-01-16 |
| US5162983A (en) | 1992-11-10 |
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| JPH0479605A (en) | Harmonic suppressor | |
| JPH0834670B2 (en) | Active filter with injection circuit | |
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| JPS61170240A (en) | Active filter | |
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